August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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71
3.8 日付、時刻、複合データ
チェックに役立つときがくるでしょう。データモデルを選ぶ際には、簡単にドキュメント形式を適
応できることが強みとなります。他にも、クエリとして
Python
ディクショナリを渡せることとク
ライアント側に生成された
ObjectId
にアクセスできるので便利です。
これで例
3-1
の
nobel_winners
を必要なすべてのファイルフォーマットとデータベースに渡し
ました。まとめの前に、日付と時刻を扱う特殊な場合を考えてみましょう。
3.8
日付、時刻、複合データ
データ可視化作業には日付と時刻を楽に扱えることが求められますが、日付と時刻の扱いが難し
い場合があります。日付や日時を文字列として表す方法は数多くあり、それぞれ異なるエンコード
やデコードが必要です。そのため、自分の作業ではフォーマットを
1
つに決め、他の人にも同じ
フォーマットを使うように勧めるとよいでしょう。日付と時刻の文字列表現として国際標準化機
構（
ISO
：
International Standard Organization
）である
ISO 8601
時間フォーマット（
http://bit.
ly/1OcC731
）と協定世界時（
UTC
：
Coordinated Universal Time
）
†
を使うことをお勧めします。
以下は、
ISO 8601
の日付と日時文字列の例です。
2015-09-23
日付（
Python/C
フォーマットコード
'%Y-%m-%d'
）
2015-09-23T16:32:35Z UTC
（時刻の後の
Z
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.